5.8 Pipes
5.8.1 Pipe installation
When installing the pipes, the pump housing must not be stressed
by the pipes.
The inlet and outlet pipes must be of an adequate size, taking the
pump inlet pressure into account.
The pipes must be installed in a way that air pockets are avoided,
especially on the inlet side of the pump.
TM002263
Pipelines
The isolating valves must be fitted on either side of the pump to
avoid having to drain the system if the pump needs to be cleaned or
repaired. The pipes must be adequately supported as close to the
pump as possible, both on the inlet and the outlet side. The
counterflanges must lie true against the pump flanges without being
stressed as stress would cause damage to the pump.
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TM085937
Pump installation
5.8.2 Direct mounting in pipes
To ensure quiet operation, suspend the pipes from
suitable pipe hangers.
Pumps fitted with motors up to and including frame size 132 are
suitable for direct mounting in supported pipes.
TM053337
Direct mounting in pipes
This type of installation does not allow the use of expansion joints.
5.8.3 Bypass
DANGER
Explosion hazard
Death or serious personal injury
‐ The pump is not allowed to run against a closed valve
except during startup. Operating against a closed
valve at an extended period of time will cause an
increase in temperature and the formation of steam
and may result in damages to or explosion of the
pump housing. The valve must be kept open during
operation.
If there is any danger of the pump running against a closed valve,
ensure a minimum liquid flow through the pump by connecting a
bypass or drain to the outlet pipe. The minimum flow rate must be
at least 10 % of the maximum flow rate. The flow rate and head are
stated on the pump nameplate.
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English (US)
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